The third member of the household was Tia Marta's husband, do (uncle) Diego, but he was very old and lame, and could not work.

Tia Marta earned the living, and Arturo usually thought of himself as dwelling with tia Marta rather than do Diego.
Arturo never quarreled with his uncle.
When the overland train stopped at the station for water, and Arturo rushed breathlessly to sell his horned toad, the eager boy found no passenger who was desirous of being a customer save an old gentleman who doubtfully offered twenty-five cents for the creature.

'Arturo stuck bravely to his intended price of "four bits," but the train creaked for starting, and, alarmed, the boy hastily handed over the toad, took the quarter of a dollar, and rushed off the train.
The old gentleman shouted from the platform for instructions as to feeding his pet, 'axed Arturo shouted back advice in broken English to let it catch "muchos, muchos" (many) flies, and have "mucho, mucho" air.

The toad was in a pasta-board box at present.

Arturo was anxious that it should be well treated, for the boy felt it would not be fair to make the creature a prisoner, and then sell it to somebody who would starve it.
The old gentleman seemed satisfied with the shouted directions.